Thread-clamping mechanism for looms



A. C. VARNUM ET AL- THREAD CLAMPING MECHANISM FOR LOOMS Filed March 10 Inventor: Jlrlhur C.

Mirna-in Jm es fiirdsa j orne Patented Jan. 8, 1924.

UNITED-S ATES.

.ABTHUB o. vAenUM AND .IAMEs PATENT o'FF ce.

nnnnsr BIRDSALL; or scorn-BR DGE, Massa- .CHUSET'ISQ TVHREVAD-CL'AMPING MECHANISM-FOR LOOMS.

Application fi1ed March .10, 1922. Serial No. 542,668,

To all whom it mag concern:

Be it known that we, umen C. VARNUM and JAMES E. BIRDsAIJL, citizens of the United States, residing at Southbridgefln the county of Worcester and Commonwealth of Massachusetts, have invented a new and useful Improvement in a Thread-Clamping Mechanism for Looms, of which the follow ing, together with the accompanying drawings, is a specification.

Our invention relatesto automatic filling replenishing looms and has particular refso that there will beibut little possibility of and then. to part'the thread adjacent to the V edge of the cloth'by a temple th'r'ead cutter.

The. object of our inventionisto provide improved means associated with the thread parting mechanishm' adjacent to the shuttle for securely and elfectively clamping either fine or coarse thread or yarn at that point,

the thread bein pulled out of. the clamp or of being parted by the clamping action prior to the parting of the thread by the temple thread cutter, all as will hereinaftermo're fully appear,'reference being had to the accompanying drawings in which,

Fig. l'is a transverse sectional view of a portionof a loom having our thread clamping mechanism applied thereto. I

Fig. 2 is an enlarged view in side elevation showing the details of the thread clamping mechanism. l 1

Fg. 3 is a' front View of the parts shown in Fig. 2. i i

Fig. 4 is a plan view of the'stationary thread clamping member. 7

Like referencefcharacters refer to like parts inthe different figures.

Referring to Fig. 1, the, lay 1, carrying a shuttle box 2, is adapted to be oscillated in the usual manner by any suitable means, not

shown. A portion of the magazine of the loom is indicated" at 3 and'a rock shaftAc, extending across thefloom, is adaptedito be turned in the direction of the arrow to operate the weft replenishingmechanism of 7 the magazine. A'shuttle feeler member '5, pivotally mounted on a stud 6, is, normally adapted to be maintained in an inoperative position with respect to the lay-1 by means 1 of a spring 7 acting through an arm 8; and a lever 9 mounted onth-e rock vshaft 4 is adapted to, move the feeler member 51in the direction of the lay 1 upon operation of the filling replenishingmechanism.

As best'shown in Fig. 2, the upper end of the shuttle feeler 5 is provided witha notch-10 to receive the filling thread when with respect to the shuttle box 2. Afixed blade 11 is secured to the feeler 5 at the lower edge of the notch and a movable out} the feeler is moved into operative position ting'blade 12 is pivotally mounted on a stud 13 extending through the feeler mem-. her 5. The movable blade 12 is provided i g with a heel portion 14' which is adapted to be engaged by the lay l when the shuttle feeler 5 .is moved intoits operative position,

whereby the blade/112 is turned on the stud V 13-to part the thread between the cooper'at- I ing edges of theblades -11 and12. The

movable blade12 is further provided with a pin 15, whereby the'blade may be opened after parting the thread, as will be herein after described.

The. parts of a loom described far i i represent a usual and wellv known construcmeans for clamping the filling thread asit' is severed bythe blades carried by the shut.

'90 tion a-nd therefore form no part of four' tlefeeler. To this end a plate 16 is mounted on the shuttle 'feeler 5 by the-stud .13 I

and is held in close engagement with the movable blade '12 by 'm'eansvof aresilient member 17; As best shown inpFigc-, the plate 16 is provided withan oflset po'rtion 18 located opposite to the stationary'blade 11.

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The portion 18 provides a space 18 within which is rotatably mountedarollerelil orrfa 7 pin 20, extending between the walls'ofthe ofi'set portion 18. The roller19 is of such diameter that the movable cutting blade 12 is adapted to just engage the periphery the roller when it is moved downwardly to part and clamp the filling thread, as will now be described;

When the rock shaft a is turned in the direction of the arrow, upon operation of the filling replenishing mechanism, the lever 9 moves the shuttle teeler 5 into the operative position shown in Fig. 1, in which the cutting blades 11 and 12 are open and the heel 14 is in the path of a projection on the lay 1. As the latter completes its forward'beat projection 21 engages the heel 14; and therebytu-rns'the cutting blade 12' about its pivot in the direction of the stationary blade 11 and the roller 19. As the filling thread is parted'by the edges of the blades lland 12, it is also clamped between the blade 12 and the rollerlt); The clamping of "the thread occurs without any tendency forit to be severed by the blade '12, for the reason that the rotatably mounted roller 19 turns slightly the thread "is iainmee between the blade and the p iphery of the roller '19, thereby eitectitely preventingseveran'ce of the thread. l fts the shuttle teeler 5 returnsto its inoperative position. the'parted'thread is still tightly clamped, so thatthere is no possibility of its being woven into the cloth before is parted by the temple thread cutter. After the temple thrcad'eutter has ope ated to part the thread adjacent the cloth, the pin 15 on the heel 14 is adapted to be engaged, by a suitable projection not shown, to turn the blade 12 in a clockwise direction about its pivot, and thereby release the severed thread.

From the foregoing,

it is apparent that we have provided an extremely effectivemeans for clamping a filling thread as it is severed at a point adjacent to the shuttle; and that our irnproved clamping means is'ad'apted' to securely hold either fine or coarse thread-0r yarn until -it severed by the temple thread cutter at a point accnt the cloth. Our clamping mechanism is part'i'cularly advantageous when a filling feeler fork is employed between the temple thread cutterand the thread parting'and clamping" mechanism," for the reztsonthat the threadbannofibe readily drawn from the clamp as it engages'the filling 'for'lr'on the movement hi the 'jti'lling ieelsi: Furthermore, our "improved clamping 'niechanism is so 'constru'cted'that it is not liable to sever the thread at the point of clampingQas in previousconstructions, for the reason that the roller turns slightly'as the thread is wedged between the movable cutting blade and the periphery of-the roller. The fact that the threadis held by rolling frietionbe tween the roll and an opposed surface allows considerable force to be applied to the movable blade for cutting without danger of the impact severing the thread at the point of clamping.

While we have shown our improved clamping mechanism in connection with a particular form of filling feeler and thread parter, it is not so'limited, but is capable otbeing applied to other loom constructions without departing from the spirit and scope of our invention. We -desire therefore that only such limitations be imposed thereon as may'come within the scope of the appended claims \Ve claim,

1. In an automatic filling replenishing loom, the combination with a thread p-arter to act upon'the thread of the filling supply to be abandoned, and comprisinga'inovable blade and a surface of revolution, of means formoving said blade to clampthe thread by rolling friction betweensaid blade and .ce of revolution;

an automatic filling replenishing locni, thecombination with a thread parter to act upon'the thread of the filling supply to be abandoned, and comprising movable blade,iot a freely rotatable member adapted by its movement in" connection with said blade to clamp the thread'betiveen opposed surfaces of said blade and of said member.

3. In an automatic filling replenishing loom, the'combin'ation with a thread parter to act uponthe thread of the filling supply to be abandoned, and comprising a movable blade, of 'a'treely rotatable roller having'its axis parallel to the'said bladejand dependent upon the movement of the blade to clamp the thread.

4 L. In an automatic filling replenishii'ig loom, the combination with a thread parter to act upon the thread 01? the fillingsupply to be abandoned, and comprising a movable blade, of a plate in. engagement with said blade and car yi n" rotatable roll with its axis parallel to said blade;

"5. In an automatic filling replenishing loom. the combination with a thread parter to act upon the thread of thefilling supply to beabandoned. 'a'nd."comprising a movable blade, of a plate inengagement with said blade and carrying a1freely"rotatable roll with its axis parallel to said blade, the said blade being" substantially tangent to the surface of said roll.

" ARTHUR C. VARNUM.

JAMES ERNEST BIRDSALL. Witnesses: 4

GEORGE S. RroH, Cir-Aisles 'JoH 'NsoN. 

